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SUN Sun Certified Web Component Developer for J2EE 5 Sample Questions:

1. As a convenience feature, your web pages include an Ajax request every five minutes to a special servlet that monitors the age of the user's session. The client-side JavaScript that handles the Ajax callback displays a message on the screen as the session ages. The Ajax call does NOT pass any cookies, but it passes the session ID in a request parameter called sessionID. In addition, assume that your webapp keeps a hashmap of session objects by the ID. Here is a partial implementation of this servlet:
10. public class SessionAgeServlet extends HttpServlet {
11. public void service(HttpServletRequest request, HttpServletResponse) throws
IOException {
1 2. String sessionID = request.getParameter("sessionID");
1 3. HttpSession session = getSession(sessionID);
1 4. long age = // your code here
1 5. response.getWriter().print(age);
1 6. }
... // more code here
4 7. }
Which code snippet on line 14, will determine the age of the session?

A) session.getLastAccessedTime().getTime() - session.getCreationTime().getTime();
B) session.getMaxInactiveInterval() - session.getCreationTime();
C) session.getLastAccessed().getTime() - session.getCreationTime().getTime();
D) session.getLastAccessed() - session.getCreationTime();
E) session.getMaxInactiveInterval();
F) session.getLastAccessedTime() - session.getCreationTime();

2. Given:
3 . class MyServlet extends HttpServlet {
4 . public void doPut(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, IOException {
5. // servlet code here
...
2 6. }
2 7. }
If the DD contains a single security constraint associated with MyServlet and its only <http- method> tags and <auth-constraint> tags are:
< http-method>GET</http-method>
< http-method>PUT</http-method>
< auth-constraint>Admin</auth-constraint>
Which four requests would be allowed by the container? (Choose four.)

A) A user whose role is Admin can perform a POST.
B) A user whose role is Admin can perform a GET.
C) A user whose role is Admin can perform a PUT.
D) A user whose role is Member can perform a POST.
E) A user whose role is Member can perform a PUT.
F) A user whose role is Member can perform a GET.

3. The Squeaky Beans Inc. shopping application was initially developed for a non-distributed environment. The company recently purchased the Acme Application Server, which supports distributed HttpSession objects. When deploying the application to the server, the deployer marks it as distributable in the web application deployment descriptor to take advantage of this feature.
Given this scenario, which two must be true? (Choose two.)

A) The J2EE web container must support migration of objects that implement Serializable.
B) Storing references to Enterprise JavaBeans components in the HttpSession object might
NOT be supported by J2EE web containers.
C) The J2EE web container must use the native JVM Serialization mechanism for distributing HttpSession objects.
D) As per the specification, the J2EE web container ensures that distributed HttpSession objects will be stored in a database.

4. In a JSP-centric shopping cart application, you need to move a client's home address of the Customer object into the shipping address of the Order object. The address data is stored in a value object class called Address with properties for: street address, city, province, country, and postal code. Which two JSP code snippets can be used to accomplish this goal? (Choose two.)

A) <jsp:setProperty name='${order}' property='shipAddress'
value='${client.homeAddress}' />
B) <c:set target='${order}' property='shipAddress'>
< jsp:getProperty name='client' property='homeAddress' />
< /c:set>
C) <c:set var='order' property='shipAddress'>
< jsp:getProperty name='client' property='homeAddress' />
< /c:store>
D) <c:setProperty name='${order}' property='shipAddress'>
< jsp:getProperty name='client' property='homeAddress' />
< /c:setProperty>
E) <c:set var='order' property='shipAddress'
value='${client.homeAddress}' />
F) <c:set target='${order}' property='shipAddress'
value='${client.homeAddress}' />

5. You are designing an n-tier Java EE application. You have already decided that some of your JSPs will need to get data from a Customer entity bean. You are trying to decide whether to use a Customer stub object or a Transfer Object. Which two statements are true? (Choose two.)

A) Only the Transfer Object will need to use a Business Delegate.
B) In both cases, the JSPs can use EL expressions to get data.
C) The stub will increase network traffic.
D) Using the stub approach allows you to design the application without using a Service
Locator.
E) The Transfer Object will decrease data staleness.
F) The stub will increase the logic necessary in the JSPs.

Solutions: